1. In general, countries as reported at each census. Data are not totally comparable over time due to changes in boundaries for some countries. Great Britain excludes Ireland. United Kingdom includes Northern Ireland. China in 1990 includes Hong Kong and Taiwan.

Source:Profile of the Foreign-Born Population in the United States: 2000, U.S. Census Bureau, 2001. 2011 American Community Survey 1-Year Estimates: Place of Birth for the Foreign-Born Population in the United States.